Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: quantos distritos com candidatos sendo william b. bankhead (d) 71,3% e. m. reed (r) 28,7%
 ###Tabelas: CREATE TABLE highest_capped (highest_capped_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Career VARCHAR, Caps INT, Goals INT, First Cap VARCHAR, Recent Cap VARCHAR) CREATE TABLE dsds_performances (dsds_performances_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Topic of the Show VARCHAR, Song VARCHAR, Original Artist VARCHAR, Place/Percentage VARCHAR) CREATE TABLE singles_performances_4–2 (singles_performances_4–2_id AUTO_INCREMENT PRIMARY KEY, Edition VARCHAR, Round VARCHAR, Date VARCHAR, Against VARCHAR, Surface VARCHAR, Opponent VARCHAR, Win/Lose VARCHAR, Result VARCHAR) CREATE TABLE composition_of_the_17th_seanad (composition_of_the_17th_seanad_id AUTO_INCREMENT PRIMARY KEY, Administrative Panel INT, Agricultural Panel INT, Cultural and Educational Panel INT, Industrial and Commercial Panel INT, Labour Panel INT, National University of Ireland INT, University of Dublin INT, Nominated by the Taoiseach INT, Total INT) CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR)  
SELECT COUNT District FROM  WHERE Candidates = William B. Bankhead (D) 71.3% E. M. Reed (R) 28.7%